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<h2><span class="refentrytitle"><a name="gtk-Feature-Test-Macros.top_of_page"></a>Version Information</span></h2>
<p>Version Information — Variables and functions to check the GTK+ version</p>
</td>
<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="gtk-Feature-Test-Macros.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gtk/gtk.h&gt;

extern const guint  <a class="link" href="gtk-Feature-Test-Macros.html#gtk-major-version" title="gtk_major_version">gtk_major_version</a>;
extern const guint  <a class="link" href="gtk-Feature-Test-Macros.html#gtk-minor-version" title="gtk_minor_version">gtk_minor_version</a>;
extern const guint  <a class="link" href="gtk-Feature-Test-Macros.html#gtk-micro-version" title="gtk_micro_version">gtk_micro_version</a>;
extern const guint  <a class="link" href="gtk-Feature-Test-Macros.html#gtk-binary-age" title="gtk_binary_age">gtk_binary_age</a>;
extern const guint  <a class="link" href="gtk-Feature-Test-Macros.html#gtk-interface-age" title="gtk_interface_age">gtk_interface_age</a>;
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *       <a class="link" href="gtk-Feature-Test-Macros.html#gtk-check-version" title="gtk_check_version ()">gtk_check_version</a>                   (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> required_major</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> required_minor</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> required_micro</code></em>);

#define             <a class="link" href="gtk-Feature-Test-Macros.html#GTK-MAJOR-VERSION:CAPS" title="GTK_MAJOR_VERSION">GTK_MAJOR_VERSION</a>
#define             <a class="link" href="gtk-Feature-Test-Macros.html#GTK-MINOR-VERSION:CAPS" title="GTK_MINOR_VERSION">GTK_MINOR_VERSION</a>
#define             <a class="link" href="gtk-Feature-Test-Macros.html#GTK-MICRO-VERSION:CAPS" title="GTK_MICRO_VERSION">GTK_MICRO_VERSION</a>
#define             <a class="link" href="gtk-Feature-Test-Macros.html#GTK-BINARY-AGE:CAPS" title="GTK_BINARY_AGE">GTK_BINARY_AGE</a>
#define             <a class="link" href="gtk-Feature-Test-Macros.html#GTK-INTERFACE-AGE:CAPS" title="GTK_INTERFACE_AGE">GTK_INTERFACE_AGE</a>
#define             <a class="link" href="gtk-Feature-Test-Macros.html#GTK-CHECK-VERSION:CAPS" title="GTK_CHECK_VERSION()">GTK_CHECK_VERSION</a>                   (major,
                                                         minor,
                                                         micro)
</pre>
</div>
<div class="refsect1">
<a name="gtk-Feature-Test-Macros.description"></a><h2>Description</h2>
<p>
GTK+ provides version information, primarily useful in configure checks
for builds that have a configure script. Applications will not
typically use the features described here.
</p>
</div>
<div class="refsect1">
<a name="gtk-Feature-Test-Macros.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gtk-major-version"></a><h3>gtk_major_version</h3>
<pre class="programlisting">extern const guint gtk_major_version;
</pre>
<p>
The major version number of the GTK+ library.  (e.g. in GTK+ version
1.2.5 this is 1.)
</p>
<p>
This variable is in the library, so represents the
GTK+ library you have linked against. Contrast with the
<a class="link" href="gtk-Feature-Test-Macros.html#GTK-MAJOR-VERSION:CAPS" title="GTK_MAJOR_VERSION"><span class="type">GTK_MAJOR_VERSION</span></a> macro, which represents the major version of the
GTK+ headers you have included.
</p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-minor-version"></a><h3>gtk_minor_version</h3>
<pre class="programlisting">extern const guint gtk_minor_version;
</pre>
<p>
The minor version number of the GTK+ library.
(e.g. in GTK+ version 1.2.5 this is 2.)
</p>
<p>
This variable is in the library, so represents the
GTK+ library you have linked against. Contrast with the
<a class="link" href="gtk-Feature-Test-Macros.html#GTK-MINOR-VERSION:CAPS" title="GTK_MINOR_VERSION"><span class="type">GTK_MINOR_VERSION</span></a> macro, which represents the minor version of the
GTK+ headers you have included.
</p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-micro-version"></a><h3>gtk_micro_version</h3>
<pre class="programlisting">extern const guint gtk_micro_version;
</pre>
<p>
The micro version number of the GTK+ library.
(e.g. in GTK+ version 1.2.5 this is 5.)
</p>
<p>
This variable is in the library, so represents the GTK+ library you
have linked against. Contrast with the <a class="link" href="gtk-Feature-Test-Macros.html#GTK-MICRO-VERSION:CAPS" title="GTK_MICRO_VERSION"><span class="type">GTK_MICRO_VERSION</span></a> macro, which
represents the micro version of the GTK+ headers you have included.
</p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-binary-age"></a><h3>gtk_binary_age</h3>
<pre class="programlisting">extern const guint gtk_binary_age;
</pre>
<p>
This is the binary age passed to <span class="application">libtool</span>. If
<span class="application">libtool</span> means nothing to you, don't worry
about it. ;-)
</p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-interface-age"></a><h3>gtk_interface_age</h3>
<pre class="programlisting">extern const guint gtk_interface_age;
</pre>
<p>
This is the interface age passed to <span class="application">libtool</span>. If
<span class="application">libtool</span> means nothing to you, don't worry
about it. ;-)
</p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-check-version"></a><h3>gtk_check_version ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *       gtk_check_version                   (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> required_major</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> required_minor</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> required_micro</code></em>);</pre>
<p>
Checks that the GTK+ library in use is compatible with the
given version. Generally you would pass in the constants
<a class="link" href="gtk-Feature-Test-Macros.html#GTK-MAJOR-VERSION:CAPS" title="GTK_MAJOR_VERSION"><span class="type">GTK_MAJOR_VERSION</span></a>, <a class="link" href="gtk-Feature-Test-Macros.html#GTK-MINOR-VERSION:CAPS" title="GTK_MINOR_VERSION"><span class="type">GTK_MINOR_VERSION</span></a>, <a class="link" href="gtk-Feature-Test-Macros.html#GTK-MICRO-VERSION:CAPS" title="GTK_MICRO_VERSION"><span class="type">GTK_MICRO_VERSION</span></a>
as the three arguments to this function; that produces
a check that the library in use is compatible with
the version of GTK+ the application or module was compiled
against.
</p>
<p>
Compatibility is defined by two things: first the version
of the running library is newer than the version
<em class="parameter"><code>required_major.required_minor</code></em>.<em class="parameter"><code>required_micro</code></em>. Second
the running library must be binary compatible with the
version <em class="parameter"><code>required_major.required_minor</code></em>.<em class="parameter"><code>required_micro</code></em>
(same major version.)
</p>
<p>
This function is primarily for GTK+ modules; the module
can call this function to check that it wasn't loaded
into an incompatible version of GTK+. However, such a
a check isn't completely reliable, since the module may be
linked against an old version of GTK+ and calling the
old version of <a class="link" href="gtk-Feature-Test-Macros.html#gtk-check-version" title="gtk_check_version ()"><code class="function">gtk_check_version()</code></a>, but still get loaded
into an application using a newer version of GTK+.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>required_major</code></em> :</span></p></td>
<td>the required major version.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>required_minor</code></em> :</span></p></td>
<td>the required minor version.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>required_micro</code></em> :</span></p></td>
<td>the required micro version.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the GTK+ library is compatible with the
given version, or a string describing the version mismatch.
The returned string is owned by GTK+ and should not be modified
or freed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GTK-MAJOR-VERSION:CAPS"></a><h3>GTK_MAJOR_VERSION</h3>
<pre class="programlisting">#define GTK_MAJOR_VERSION				(2)
</pre>
<p>
Like <a class="link" href="gtk-Feature-Test-Macros.html#gtk-major-version" title="gtk_major_version"><span class="type">gtk_major_version</span></a>, but from the headers used at
application compile time, rather than from the library linked against
at application run time.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GTK-MINOR-VERSION:CAPS"></a><h3>GTK_MINOR_VERSION</h3>
<pre class="programlisting">#define GTK_MINOR_VERSION				(24)
</pre>
<p>
Like <a class="link" href="gtk-Feature-Test-Macros.html#gtk-minor-version" title="gtk_minor_version"><span class="type">gtk_minor_version</span></a>, but from the headers used at
application compile time, rather than from the library linked against
at application run time.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GTK-MICRO-VERSION:CAPS"></a><h3>GTK_MICRO_VERSION</h3>
<pre class="programlisting">#define GTK_MICRO_VERSION				(10)
</pre>
<p>
Like <a class="link" href="gtk-Feature-Test-Macros.html#gtk-micro-version" title="gtk_micro_version"><span class="type">gtk_micro_version</span></a>, but from the headers used at
application compile time, rather than from the library linked against
at application run time.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GTK-BINARY-AGE:CAPS"></a><h3>GTK_BINARY_AGE</h3>
<pre class="programlisting">#define GTK_BINARY_AGE					(2410)
</pre>
<p>
Like <a class="link" href="gtk-Feature-Test-Macros.html#gtk-binary-age" title="gtk_binary_age"><span class="type">gtk_binary_age</span></a>, but from the headers used at
application compile time, rather than from the library linked against
at application run time.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GTK-INTERFACE-AGE:CAPS"></a><h3>GTK_INTERFACE_AGE</h3>
<pre class="programlisting">#define GTK_INTERFACE_AGE				(10)
</pre>
<p>
Like <a class="link" href="gtk-Feature-Test-Macros.html#gtk-interface-age" title="gtk_interface_age"><span class="type">gtk_interface_age</span></a>, but from the headers used at
application compile time, rather than from the library linked against
at application run time.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GTK-CHECK-VERSION:CAPS"></a><h3>GTK_CHECK_VERSION()</h3>
<pre class="programlisting">#define             GTK_CHECK_VERSION(major,minor,micro)</pre>
<p>
Returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the version of the GTK+ header files is the same
as or newer than the passed-in version.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>major</code></em> :</span></p></td>
<td>major version (e.g. 1 for version 1.2.5)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>minor</code></em> :</span></p></td>
<td>minor version (e.g. 2 for version 1.2.5)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>micro</code></em> :</span></p></td>
<td>micro version (e.g. 5 for version 1.2.5)</td>
</tr>
</tbody>
</table></div>
</div>
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